• Overview
• Objectives
• Completing the assignment
  • Question 01 - Have you completed the reading?
  • Question 02 - DNS server hierarchy
  • Question 03 - Types of DNS queries
  • Question 04 - Memory Caching
• Submission

In this assignment, I took a quiz based on chapter 2, sections 2.1.1-2.1.4 of Introduction to Computer Networks and Cybersecurity, which covers the topic of DNS.

• Determining the DNS server hierarchy
• Types of DNS queries
• What is the purpose of memory caching

The prompt:

I completed the Reading [True or False]

My answer:

True

The prompt:

Match the order of the DNS server hierarchy from highest to lowest

My answer:

Highest: Root Servers

Middle: Top Level Domain (TLD) Servers

Lowest: Authoritative DNS Server

The prompt:

What are the 2 types of DNS Queries

My answer:

Iterative & Recursive

The prompt:

My answer:

Once a DNS server resolves a hostname to an address, it would be very inefficient to repeat all the same steps again to retrieve the same information. In order to shortcut this process and prevent this repetition, once a DNS server learns a mapping it caches it in its local memory.

My submission can be viewed here.